> How can you argue against the reality that it's better to use a car or delivery for 20 kg, than to carry it when walking.
If you're really going to have trouble carrying 20 kg on your back for a couple of city blocks, you can use a folding rolling cart instead to do the same at the same speed and with negligible effort.
> And since it's already delivered by a truck, why walk the last bit it's pointless.
One truck carrying twenty tons of groceries is not the same as one car carrying a few cases of bottled water.
Half a bag of concrete? A cart is definitely the way to go. 51 lbs (23 kg) under ideal conditions is where National Institute of Occupational Safety and Health says manual laborers should take precautions against back injuries. Being able to deadlift it doesn’t make schlepping it all the way home a good plan.
If you're really going to have trouble carrying 20 kg on your back for a couple of city blocks, you can use a folding rolling cart instead to do the same at the same speed and with negligible effort.
> And since it's already delivered by a truck, why walk the last bit it's pointless.
One truck carrying twenty tons of groceries is not the same as one car carrying a few cases of bottled water.